Liquid level



Nov. 1, 1932. G. B. GALLASCH LIQUID LEVEL Filed an. '7. 1929- r E :1: ia: E E a FIG-1.

H C S A L Mm B E G R w INVENTOR BY ffll ZMJLL ATTORNEY Patentbd Nov.

GEORGE B. GALLASCH, OF

OPTICAL COMPANY, OF ROCHESTER, NEW YORK, A

ROCHESTER, NEW YORK, LSBIGNOB TO BAUSCH Q, LOKB CORPORATION OF NEW YORKLIQUID LEVEL Application filed January 7, 1929'. Serial Io. 380,798.

This invention relates to liquid levels and more particularly it hasreference to such types of bubble levels as are adapted for use insextants, ments, although ed to use with this type it is found varieswith a Thus, the liquid in the level expands and the bubble is reducedin size, whereas with a falling temperature the liquid is contractedinvolume and the bubble expands to a larger size. the size of the bubbleare often of such an amount as to impair the of the level, especiallywhen the level ciency Such variations in usefulness and effiis used on abubble sextant, for example.

One of the objects of the present invention is to provide an improvedand eflicient liquid level in which the bubble will be compensated fortemperature changes so that the bubble will have a substantially uniformsize at different temperatures. provide means for automaticallymaintalning the bubble of uniform size at These and other novel featuresof construction,

Another object is to a level at a substantially different temperatures.objects reside in certain arrangement and combination of parts as w1llhereinafter be more fully described and pointed out in the appendedclaims.

Referring to the drawing;

Fig. 1 shows a top plan view of one type of liquid level embodying myinvention.

Fig. 2 shows a vertical sectional view taken on line 1.1 of Fig. 1.

Fig. 3 shows a perspective view of the container with flexible walls.

disk.

. Fig. 4 shows a perspective view of a guard Fig. 5 shows a modificationembodying my invention.

preferred embodiment of my invention is illustrated in Figs. 1 to meralindicates a casing 4 wherein the nuhaving integral therewith a laterallydisposed boss or projection 11. Removably secured within the casing 10are the lens are held in place elements 12 and 12 which by the threadedretaining rings 13 and 13' which cooperate with gaskets 14. and 14' tomake a tight joint. The lens elements 12 and 12 bear against shoulders15 and 15', respectively, and are thereby held in spaced relation toform a bubble chamber 16 in which bubble 16' is contained. Theprojecting boss 11 is bored out to provlde a reservoir chamber 17 whichis closed by the removable screw cap 18 which cooperates w'th gasket 19to form a liquidtight joint. The opening or conduit 20 provides a meansof communication between the bubble chamber 16 and the reservoir chamber17 so that liquid may flow from either chamber to the other. An opening21, closed by screw 21, provides a convenient access to the chamber forthe purpose of filling the chambers with liquid.

- Positioned within the reservoir chamber 17 is the closed container orreceptacle 22 which may take any desired shape, such as that shown inFig. 3, for example. A disk 23, having a perforated down-turned edge 24,is placed in chamber 17 to prevent the container 22 from blocking theconduit 20. The wall or walls of the container are very thin andflexible so they will readily yield and respond to slight pressures. Thecontainer may be made of any suitable material such as gelatine or acellulose substance, for example. It is obvious, of course, that thematerial forming the container must be insoluble in the liquid which iscontained in the reservoir and bubble chambers. Thus,

a container made of gelatine can be used in a reservoir chamber whichcontains xylol. The container may, however, be covered with a very thindeposit of a metal, such as silver, for example, in order from beingdissolved.

A fluid substance such as air, gas or vapor is enclosed within thesealed container 22. Preferably, the container 22 is only partly filledwith the fluid substance so that the walls will be partially collapsed,as shown in the dotted lines in Fig. 2, thereby providing a latitude forexpansion or contraction of the walls of the container. The container 22is preferably sealed up at normal room temperature and the substanceenclosed to protect the container 18 is then screwed into place.

-- s which illustrates the the level of therein is under atmosphericpressure. The

container 22 has a cubical content which is many times larger than thatof the bubble In assemblin the level, a suitable liquid, such as xylol,or exam le, is filled into the bubble chamber 16 so t at a bubble 16',of the desired size, is formed. The container 22 is then placed inchamber 17 liquid is added so as to almost fill the chamber and the capLiquid is then added through opening 21 to completel fill the chamberand exclude all traces air, after which the screw 21 is inserted.

When the level is subjected to a temperature which is higher than normalroom temperature, the liquid in the level will expand and the force willtend to reduce the size of the bubble 16. The force of such expansion,however, will be distributed throu hout the liquid in both chambers 16and 1 Since the container 22 has a relatively large surface area incontact with the liquid, the thin, yieldable walls of the container willbe com pressed and the force due to the expansion of the liquid will besubstantially absorbed by container 22 so that the change in size ofbubble 16' will be practicall negligible. Similarly, when the level issu jected to a lower temperature, the liquid will be contracted and thewalls of container 22 will expand so that the bubble will retain asubstantiallyuniform size.

In Fig. 51 have shown a modification application of my invention to aliquid level of the tubular type. The level comprises a tubular member25 having a wall or partition 26 disposed therein so as to provide achamber for the container 27. The container 27 has very thin yieldablewalls and encloses a fluid substance such as air, gas or vapor. Thevolume of the container 27 is man times that of the bubble 28. It willbe rea 'ly understood that i 5 will operate similarl to that shown in 1and 2 so that the bu ble 28 will retain a substantially uniform sizedespite changes of temperature It will be apparent from the foregoingthat my invention provides a means whereby the bubble in a liquid levelwill remain of a substantially uniform size even though subj ected todifferent temperatures. It will also be apparent that my device isautomatic In operation and hence, after the level is properly filled, itis unnecessary to make any further adjustments to compensate for thechange in size of the bubble due to temperature changes.

From the above description it will be noted that I am able to attain theobjects of my invention and provide an improved liquid level having anautomatic compensating device which will maintain the bubble at asubstantially uniform size under difierent temperatures. It is obviousthat various modifications can be made without departing from the spiritof my invention as pointed out in the appended claims.

I 0 mm:

1. A liquidlevel comprising means providing a bubble chamber, areservoir chamber, and a passageway connecting said chambers, a closedcontainer in sald reservoir chamber, said container having yieldablewalls and a gaseous substance enclosed there- 1n.

2. A liquid level comprisin communicating bubble and reservoir cham ers,a rece tacle disposed within said reservoir cham r said receptaclehaving a yieldable wall and containing a gaseous substance, the cubicalcontents of said receptacle being several times greater than that of thebubble.

liquid level comprisin a bubble chamber con-taininga liquld an a bubble,a closed receptacle having a yieldablewall, said receptacle containing agaseous substance, means for putting said yieldable wall incommunication with the liquid in said bubble chamber whereby theyieldable wall compensates for changes in volume of the liquidthereby-keeping the bubble at a substantially uniform size at differenttemperatures.

4. A liquid level comprising a casing, glass members mounted in saidcasing to provide a bubble chamber, a projecting boss on the side ofsaid casing, said boss having a recess which provides a reservoir, meanshaving a passageway connecting said chamber and reservoir, a containerwithin said reservoir, said container having a yieldable wall, and meansfor limiting the movement of said container within said reservoir.

GEORGE B. GALLASCH.

